// unordered_map::hash_function
#include <bits/stdc++.h>
using namespace std;
typedef unordered_map<string,string> stringmap;
int main ()
{
    stringmap mymap;
    auto fn = mymap.hash_function();
    cout << "this: " << fn ("this") << "\n";
    cout << "thin: " << fn ("thin") << "\n";

    return 0;
}
